3 A wardrobe that weighs 2 kN is pushed with a horizontal 05

Problem: 3 500 N 0.25 m A wardrobe that weighs 2 kN is pushed with a horizontal 0.5 kN force. If the rollers remain on the floor (i.e. no tipping), what is the normal force exerted on the roller B after it starts rolling? 1.25 m a. 0.875 kN O b. 0.725 kN Oc. 0.980 kN d. 0.650 kN e. 1.12 kN 0.5 m 0.5 m

Solution

e)

Take momentum about the centre of mass

N_B*0.5-N_A*0.5=500*0.25

N_B-N_A=250

N_B+N_A=2000

N_B=1125=1.12KN